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Josamycin Substance Concentration in Serum (Mass Concentration)

Published: August 9, 2026Updated: August 16, 2026

This test measures the amount of josamycin, a type of antibiotic, in your blood serum. It helps assess how well your body is responding to josamycin treatment.

Quick summary

["Josamycin levels help doctors monitor antibiotic effectiveness and adjust treatment if needed."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
25597-6
Short code
Josamycine Susc Islt
Synonyms
Josamycine Susc Islt
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why This Test Is Done

Your healthcare provider may order this test if you’re taking josamycin to treat infections caused by bacteria that are resistant to other antibiotics. It helps ensure the correct dose is being administered and that the medication is working properly.

What to Expect Before the Test

No special preparation is usually needed. You may have a small needle inserted into your arm to draw blood. The process is quick and typically painless. If you’re on blood thinners, let your doctor know before the test.

What the Results Mean

Results are used to guide treatment decisions, such as adjusting the dose of josamycin or switching to a different antibiotic if needed. Your doctor will interpret the results in the context of your overall health and medical history.

Common Causes for Testing

This test is most commonly performed in patients with infections (like pneumonia, skin infections, or urinary tract infections) where josamycin is being prescribed. It may also be used in monitoring patients with known antibiotic resistance.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Elevated josamycin levels may indicate poor absorption, liver impairment, or incorrect dosing. Low levels could suggest the infection isn’t responding to the medication or the dose is too low. Regular monitoring helps prevent antibiotic resistance and ensures safe, effective treatment.

Short name

Josamycin Level (Serum)

Frequently asked questions

How long does it take to get my results?
Results are typically available within 1 to 3 business days, depending on your lab’s processing time. Your doctor will contact you once the results are ready.
What if my levels are too high or too low?
If your levels are outside the expected range, your doctor may adjust your dosage, switch to a different antibiotic, or investigate potential issues like liver function or drug interactions.
Can I eat or drink before this test?
You can eat and drink normally before the test unless instructed otherwise. Avoiding food or fluids for a specific period isn’t required for this test.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy